Spatter cones erupting basalt lava (daytime, 28 March 2021) (Geldingadalur Valley, Iceland) 3 : 無料・フリー素材/写真
Spatter cones erupting basalt lava (daytime, 28 March 2021) (Geldingadalur Valley, Iceland) 3 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | (Web camera screen capture video taken in the daytime of 28 March 2021.)----------------------------------------------------------On 19 March 2021, a basaltic lava flow eruption started in the Geldingadalur Valley, next to the Fagradalsfjall Volcano in southwestern Iceland's Reykjanes Peninsula. This followed a swarm of about 50,000 earthquakes that occurred during the previous month. The eruption reportedly started as a fissure eruption - lava was spewed from an extensive crack in the ground. This evolved into a short chain of spatter cones, one of which ended up being larger than the others (= main cone), with more energetic activity.Spatter cones are small to very small, steep-sided volcanic cones formed by the accumulation and solidification of blobs of lava that sputtered from a vent. They are usually basaltic in composition.Two active spatter cones are seen here - the one on the right is the main cone. The one on the left started from two very small spatter cones that subsequently enlarged and became one structure. The geometry and path of the main cone's lava exit channel changed frequently over previous days. Some time in the last day, the main cone breached itself - lava fountaining is now diminished in height and lava drains from the breach on the left side.Iceland is a volcanic island in the North Atlantic Ocean between Britain and Greenland. It is situated on the Mid-Atlantic Ridge, along which the North American Plate and the Eurasian Plate separate and new oceanic crust forms. Seismicity in the area is due to subsurface magma movement from hotspot (mantle plume) activity, as well as seafloor spreading (= tectonic divergence). Magma reaching the surface results in volcanic eruptions. Some famous eruptions in Iceland include Laki (1783), Surtsey (1963-1967), Eldfell (1973), Hekla (1991, 2000), Eyjafjallajökull (2010), and Grimsvötn (2011). |
| 撮影日 | 2021-03-28 08:00:26 |
| 撮影者 | James St. John |
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